Final answer:
The appropriate response in the given dialogue is to accept the invitation for coffee, which aligns with the norms of friendly workplace social interactions and group events.
Step-by-step explanation:
In the given dialogue, the appropriate response following the cultural cues and norms discussed would be to accept the invitation for coffee. The person has already indicated their affinity for coffee and has been offered to have one by their colleague. Accepting the offer is a natural continuation of the conversation and fits within the context of friendly and informal workplace relations. Furthermore, remembering to bring Anna suggests a group social event, which is encouraged as a means of strengthening interpersonal connections.